Outage Performance of Full-Duplex Overlay CR-NOMA Networks with SWIPT

In this paper, we propose a novel non-orthogonal multiple access (NOMA)-assisted cooperative overlay spectrum-sharing network, in which a full- duplex (FD) secondary transmitter (ST) is selected for relaying the primary transmitter's information and transmitting its own to the primary receiver and secondary receivers, respectively, using NOMA approach. In order to encourage the ST to perform secondary cooperative transmission and maintain its operation, simultaneous wireless information and power transfer (SWIPT) technique is exploited to scavenge energy from the primary signal. To assess the performance of the proposed system, the outage probabilities for the primary and secondary networks are derived in tight closed-form approximations. Numerical results show that the combination of FD, SWIPT, and NOMA technologies greatly benefits the cooperative overlay spectrum- sharing network in terms of outage probability, when compared with that of half-duplex NOMA and conventional orthogonal multiple access networks.